LXR linux/include/linux/gnss.h

   1/* SPDX-License-Identifier: GPL-2.0 */
   2/*
   3 * GNSS receiver support
   4 *
   5 * Copyright (C) 2018 Johan Hovold <johan@kernel.org>
   6 */
   7
   8#ifndef _LINUX_GNSS_H
   9#define _LINUX_GNSS_H
  10
  11#include <linux/cdev.h>
  12#include <linux/device.h>
  13#include <linux/kfifo.h>
  14#include <linux/mutex.h>
  15#include <linux/rwsem.h>
  16#include <linux/types.h>
  17#include <linux/wait.h>
  18
  19struct gnss_device;
  20
  21enum gnss_type {
  22        GNSS_TYPE_NMEA = 0,
  23        GNSS_TYPE_SIRF,
  24        GNSS_TYPE_UBX,
  25        GNSS_TYPE_MTK,
  26
  27        GNSS_TYPE_COUNT
  28};
  29
  30struct gnss_operations {
  31        int (*open)(struct gnss_device *gdev);
  32        void (*close)(struct gnss_device *gdev);
  33        int (*write_raw)(struct gnss_device *gdev, const unsigned char *buf,
  34                                size_t count);
  35};
  36
  37struct gnss_device {
  38        struct device dev;
  39        struct cdev cdev;
  40        int id;
  41
  42        enum gnss_type type;
  43        unsigned long flags;
  44
  45        struct rw_semaphore rwsem;
  46        const struct gnss_operations *ops;
  47        unsigned int count;
  48        unsigned int disconnected:1;
  49
  50        struct mutex read_mutex;
  51        struct kfifo read_fifo;
  52        wait_queue_head_t read_queue;
  53
  54        struct mutex write_mutex;
  55        char *write_buf;
  56};
  57
  58struct gnss_device *gnss_allocate_device(struct device *parent);
  59void gnss_put_device(struct gnss_device *gdev);
  60int gnss_register_device(struct gnss_device *gdev);
  61void gnss_deregister_device(struct gnss_device *gdev);
  62
  63int gnss_insert_raw(struct gnss_device *gdev, const unsigned char *buf,
  64                        size_t count);
  65
  66static inline void gnss_set_drvdata(struct gnss_device *gdev, void *data)
  67{
  68        dev_set_drvdata(&gdev->dev, data);
  69}
  70
  71static inline void *gnss_get_drvdata(struct gnss_device *gdev)
  72{
  73        return dev_get_drvdata(&gdev->dev);
  74}
  75
  76#endif /* _LINUX_GNSS_H */
  77